RFR: JDK-8312466: /bin/nm usage in AIX makes needs -X64 flag

[Andreas Steiner]

On AIX the 'nm' needs -X64 option.

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Commit messages:
 - JDK-8312466

Changes: https://git.openjdk.org/jdk/pull/15036/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15036&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8312466
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15036.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15036/head:pull/15036

PR: https://git.openjdk.org/jdk/pull/15036